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High Efficiency Up‐Conversion Random Lasing from Formamidinium Lead Bromide/Amino‐Mediated Silica Spheres Composites
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-20 , DOI: 10.1002/adom.202000290 Jie Yang 1, 2 , Zhengzheng Liu 3, 4 , Mingyu Pi 2 , Hao Lin 1 , Fanju Zeng 1 , Yao Bian 1 , Tongchao Shi 3, 4 , Juan Du 3, 4, 5 , Yuxin Leng 3, 4, 5 , Xiaosheng Tang 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-20 , DOI: 10.1002/adom.202000290 Jie Yang 1, 2 , Zhengzheng Liu 3, 4 , Mingyu Pi 2 , Hao Lin 1 , Fanju Zeng 1 , Yao Bian 1 , Tongchao Shi 3, 4 , Juan Du 3, 4, 5 , Yuxin Leng 3, 4, 5 , Xiaosheng Tang 1
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Formamidinium (HC(NH2)+; FA) lead halide perovskites have emerged as potential candidates for solar cells, light‐emitting diodes, and lasing applications. However, the severely poor photostability of this material under UV irradiation seriously restricts the application on optoelectronic devices. In this paper, formamidinium lead halide (FAPbX3) quantum dots (QDs) adhered uniformly on the surface of amino‐mediated silica (A‐SiO2) spheres are successfully synthesized using a facile ligand‐assisted reprecipitation (LARP) method. Amazingly, the FAPbBr3/A‐SiO2 composites demonstrate excellent photostability after continuous illumination under UV lamps due to the effective suppression of the interactions and mutual contact between FAPbBr3 particles. In addition, the up‐conversion random lasing with a high quality (Q) factor of 1307 and low threshold of 413.7 µJ cm‐2 is successfully achieved from the FAPbBr3/A‐SiO2 composites at room‐temperature, which originates from the multiple random scattering of light and photon recycling provided by the silica spheres and the high gain characteristic of FAPbBr3 QDs. Moreover, different from regular lasers, random lasing does not rely on a laser cavity, which is promising in angle‐unlimited optical performance and easy/low‐cost fabrication. This work will open the window of high‐performance random lasers for digital light projector, high speed imaging, and speckle‐free full‐field imaging application.
中文翻译：
甲ami溴化铅/氨基介导二氧化硅球复合材料的高效上转换随机激光
甲ami（HC（NH 2）+ ; FA）卤化钙钛矿已经成为太阳能电池，发光二极管和激光应用的潜在候选材料。但是，这种材料在紫外线照射下的光稳定性极差，严重限制了在光电器件上的应用。本文采用简便的配体辅助再沉淀（LARP）方法成功合成了均匀粘附在氨基介导的二氧化硅（A-SiO 2）球表面上的甲ami卤化铅（FAPbX 3）量子点（QDs）。令人惊讶的是，FAPbBr 3 / A-SiO 2由于有效抑制了FAPbBr 3颗粒之间的相互作用和相互接触，复合材料在紫外线灯下连续照射后表现出出色的光稳定性。此外，FAPbBr 3 / A-SiO 2复合材料在室温下成功实现了具有高（Q）因子1307和低阈值413.7 µJ cm -2的上转换随机激光。二氧化硅球提供的光和光子循环的多次随机散射以及FAPbBr 3的高增益特性QD。此外，与常规激光器不同，随机激光不依赖于激光腔，这在无角度限制的光学性能和容易/低成本的制造中很有希望。这项工作将打开用于数字投光器，高速成像和无斑点全场成像应用的高性能随机激光器的窗口。
更新日期：2020-06-19
中文翻译：
甲ami溴化铅/氨基介导二氧化硅球复合材料的高效上转换随机激光
甲ami（HC（NH 2）+ ; FA）卤化钙钛矿已经成为太阳能电池，发光二极管和激光应用的潜在候选材料。但是，这种材料在紫外线照射下的光稳定性极差，严重限制了在光电器件上的应用。本文采用简便的配体辅助再沉淀（LARP）方法成功合成了均匀粘附在氨基介导的二氧化硅（A-SiO 2）球表面上的甲ami卤化铅（FAPbX 3）量子点（QDs）。令人惊讶的是，FAPbBr 3 / A-SiO 2由于有效抑制了FAPbBr 3颗粒之间的相互作用和相互接触，复合材料在紫外线灯下连续照射后表现出出色的光稳定性。此外，FAPbBr 3 / A-SiO 2复合材料在室温下成功实现了具有高（Q）因子1307和低阈值413.7 µJ cm -2的上转换随机激光。二氧化硅球提供的光和光子循环的多次随机散射以及FAPbBr 3的高增益特性QD。此外，与常规激光器不同，随机激光不依赖于激光腔，这在无角度限制的光学性能和容易/低成本的制造中很有希望。这项工作将打开用于数字投光器，高速成像和无斑点全场成像应用的高性能随机激光器的窗口。
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